404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Ffr%2F15757007%2Fjohann_christian_bach_vauxhall_songs__second_collection__w_h_28-31%2F&title=Vauxhall+songs.+Second+collection.+W+H+28-31 was not found on this server. That’s all we know.